摘要
根据瓦斯逸出量和风流场特点,对采用竖井辅助通风下瓦斯隧道施工通风建立流体力学分析模型,研究了隧道内流场分布规律和瓦斯迁移扩散规律。应用RNG k-ε双方程湍流模型对不同风速下施工通风效果进行了仿真模拟,研究表明:根据气流特点可在隧道纵向不同区段划分不同分区;当断面风速大于0.5m/s可保证隧道气流达到完全紊流状态;控制隧道断面风速对消除隧道拱顶瓦斯分层积聚现象具有明显的效果;瓦斯隧道施工通风必须同时满足稀释瓦斯浓度和断面风速的要求。
Based on gas escaped volume and flow field, the model of fluid dynamics was set up based on con- struction ventilation in gas tunnel by using assisted draft in vertical shaft, and the flow field distribution and law of gas transportation were studied. The ventilation effect under different wind velocity was simulated by using RNG k-~ two- equation model. The results show that there were different division in tunnel longitudinal direction according to the flow characteristics ; flow in the tunnel developed in turbulent when the flow velocity of tunnel section was more than 0.5 m/s ; controlling velocity of flow was effective to eliminate gas stratified accumulation in tunnel ; the ventilation of gas tunnel construction must meet the demands of dilution and cross-section wind speed.
出处
《地下空间与工程学报》
CSCD
北大核心
2014年第1期184-190,共7页
Chinese Journal of Underground Space and Engineering
关键词
瓦斯隧道
施工通风
数值模拟
gas tunnel
construction ventilation
numerical simulation
